* {
    margin    : 0;
    padding   : 0;
    box-sizing: border-box;
}
.big_box {
    position: relative;
    width: 900px;
    height: 550px;
    margin: 20px 330px;
}
.box {
    position: absolute;
    top: 0px;
    left: 0px;
    height     : 550px;
    width      : 500px;
    font-family: 'Microsoft YaHei';
}